Masks are used as a way to specify an area for sculpting or texture
painting for pen depth and transparency. The basic principle of a
stencil is the idea here. The mask and materials could be moved
and rotated independently using new navigation controls. Masks
and materials could be rotated discretely on 45 degrees using
SHIFT.

Pay attention, if you choose to display mask/material in at
least one of the channels (depths and/or, colors and/or specular,
see more detail about them below) a new panel shows up on top.
Using this panel you can manage the Masks/material preview
parameters:

Hide/Show/Auto. Hide/show/auto-hide full-screen view of texture.
You can switch regimes with the hot key “H”. Unlock/
Lock. Allows to scale and texture automatically while scaling
and moving the model.

Flip X. Flip X. Reflect texture mirror-like across.

Flip Y. Reflect texture mirror-like along vertical axes.

Mapping Method.

Paint. This mode allows you to paint with your material or mask.

Distort Image. In this mode
you can distort your mask
or material directly with
your brush. You can get
some very unique texture
work done with this feature.
It is great to use when you
have an image that doesn’t
match the mesh exactly.

Then you can use this tool,
to shape it to match the
mesh more precisely so that you can then paint with a material
or mask. As you can see in the image, the jaw line, nose
and silhouette of the head has been shaped with the distort
image feature.

Reset. Place texture in initial position.

Clear/Save/Load Distortion. With these options you to clear,
save and load your distortions. Each one is self explanatory.

Mapping Method. There are two methods with which you can
use here. “From Camera” and “Cube Mapping”.

From Camera
allows you to project the
method through the viewport.
If the “cube mapping”
application type is selected,
the material preview will
be displayed on pen only,
as opposed to full screen
(when “From camera” is selected). To the right there is a slider responsible for transparency
when viewing the Masks/material.

Opacity of preview. Percentile based opacity controls.
Adding a new mask or material is done exactly as you do with
Pens and Strips.